San Diego County expecting heavy rain
SAN DIEGO (KUSI) – Tuesday 7:20 a.m. – Parts of San Diego County remain under a flash flood watch Tuesday as precipitation ranging from light showers to heavy downpours is expected.
An excess of rainfall is possible, but the flash flood watch should expire at 5 p.m.
"A trough of low pressure and associated deep layer moisture will bring the potential for thunderstorms with heavy rain and flash flooding through this afternoon," according to the weather service. "The greatest potential will be over the mountains and deserts this afternoon, with smaller chances in the San Diego County valleys and the Inland Empire."
The risk of flooding is expected to end in all parts of the county Wednesday morning, and drier conditions would prevail later in the week as
high pressure rebuilds over the southwest.
Monday 10:16 a.m. – San Diego County should expect increased humidity and heighten risk for dangerous flash flooding in some areas due to the heavy rain and thunderstorms likely to drench parts of the county.
A National Weather Service flash flood watch for the valleys, mountains and deserts is scheduled to take effect at 11 a.m. and extend until Tuesday afternoon.
The coast was not included under the watch, but forecasters said showers, thunderstorms and humidity are likely this afternoon as temperatures push into the low 80s.
Rainfall in excess of an inch is expected in the deserts and the inland valleys, with more than two inches hitting the mountains. The heaviest rain is likely Monday evening into Tuesday morning as low pressure combines with approaching deep moisture, increasing the possibility of flash flooding.
"Areas most affected will be the mountains, low deserts, the San Diego County valleys and the Inland Empire," according to the weather service.
"However, heavy rain is possible for all other areas as well. The risk of flash flooding will diminish as the upper low moves off to the northeast Tuesday evening into Wednesday morning."
Forecasters advised residents with outdoor plans or who live near a flood-prone area to "be alert to rapidly changing weather conditions."
Forecasters said drier conditions would prevail later this week as high pressure builds over the southwest.